Lifting-jack.



J. B. TAYLOR.

LIFTING JACK.

APPMOATXGN ULEB Nov. 7. 190e.

Patented Feb. 2, 1909.

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JLM.

JeTH-A-M B. Tritton, oF AUBURN, NEW Yoan.

LFTING= EASE.

Specification of Letters Patent.

Patented- F'eb. 2, weary application mecLNovember '7, 190B. Serial No. 461,57?!l To all whom it may concern:

Be it known that I, JOTHAM B. TAYLOR, of Auburn, in the county of Cayu a, in the State of New York, have inventeil new and useful Improvements in Lifting-Jacks, of which the following, taken in connection with the accompanying drawings, is a full, clear and exact description. i

This invention relates to certain improvements in lifting jacks involvin the use of a tubular supportin base threa ed internally less than the length of said screw-4&1 the for receiving a hol ow screw which in turn is also-threaded internally for receiving a second screw of opposite )itch carrying at its upper end a. suitable ax e rest while the upper end of the hollow screw is provided with a ratchet wheel adapted to be rotated by a reversible awl mounted upon an operating lever whici in turn is journaled uien 'the upper end of the hollow screw directly under the ratchet wheel.

My main ohiect is to reduce the number' of parts n' oscar to the perfect operation of the lifting jacli and to also reduce the eine and wei fht to adapt the device for use as an antoine )ile ack which may be conveniently carried in theV machine without adding niaterially to its weight.

Another object is to provide a single reversible pawl slidable axially in the handle or lcver'and provided with a radially projecting hand piece moving in a transverse slot in the handle or lever and adapted to interlock with shoulders thereon.

Other objects and uses relating `to specific )arts of the device will be brought out in the lollowing description.

In the drawings-Figure 1 is a side elevation of my improved lifting 'ach Figs. 2, S and 4 are sectional views ta 'en rcsi'ieetively on lines 22, 3 3 and --4-4, Fig. 1.

This jack comprises an upright tubular supporting standard W1 havnpT a suitable supporting base `-f.- and an upper reduced und 3* which is threaded internally for receiving a hollow screw -4-, the greater )ortion of the interior of the upright --1--A below the reduced portion 457% bein;Y of greater diameter than the exterior diameter of the screw 4W so as to reduce the weight of said upright and at the sinne time to roduce the length of the u lper tl'n'caded end --3- thereby reducing the friction incidental to the operation ot' the screw 4 if.

The up )or end of the screw --l is provided wit a ratchet wheel preferably integral therewith and comparatively shallow vertically to permit a maximum vertical movement of a coaxial screw -6- which telescopes with the screw --4-- and engages an internally threaded portion Y-7 in the upper end ol' said screw -'4- and central or'tion ol' the ratchet wheel --5. This internally threaded portion --7-- of the screw vf4#d extends downwardly from the upper face of the ratchet wheel a comparatively short distance considerablyT greater portion of the interior of which is of sorneo hat larger diameter than the external diameter of the screw -'6- lo reduce the weight of the screw --4-.

T he external thread of the screw A extends from the lower ond thereof to the under side of the ratchet wheel -5- Yto permit the use of the jack Witheet the o eratinv lever and awl hereinafter describe and thereby obtain an increased vertical ad ji stment of the screw portions of the jack as it is evident that the ratchet wheel may be used as a hand wheel for moving the screws vertically rela tively to the tpright section W-l-r-. Ordinarily, however, l prefer to use an o iorating; lever -S havingr at one end a tubular hearing -9- jonrnaled n pon the n p )er end of the screw --Ll-- directly under tlie ratchet wheel while the opposite end of said lever is provided with a tubillar extension --10-- for the reception of a handle if de sired.

The intermediate portion of the lever S is provided with an 1; wardly projecting ll'g -l1v and a vertice slot -12A extending dmvnwardly from its upper face, said slot having opposite forward extensions -13-- cut into the rear side of the lug im4 forming opposed shoulders -14-. rihia h g -11--- and portion of the lever --8- at the rear side of the slot -w-l2-- are formed with circular bores or coaxial openings -15^- and -16- communicating with the slot w12 for the reception of a paul-17- and actuating spring 48m res eetively. rI`he pawl ---l7--- is made in the orin of a straight looking` bolt extending thro'` gh the opening; A15-e and having its front ,end movable into and ont of engagement with the teeth of the ratchet wheel --5 and bovelcd at one side at --Yl9- to permit the pawl to ride arrose the face of the teeth when the lever Aer-SW is rocked in one direction without operating the ratchet wheel and when the opposite sides of4 Isaid extension or offset 13.--- to prevent accidental displacement of lever to be operated'by the right.

mil W screws for lifting the vehicle or other body i -1 7-the ople lever is rocked in the opposite ldirection to rotate the screw 4 and thereby elevate or depressbothscrews simultaneously, it beunderstood that the inner screw 6 be held from rotation when en aged with the axle or other parts to be lifte The pawl -17- is provided with .a laterally projecting handle -20 movable in the slots -12- and 13 and by which the pawl -17 may berocked a half revolution to reverse the same thereby causing the rotation of the ratchetwheel --5-- and screw `4 in the opposite direction upon rocking the lever back and forth. 'I hat 1s when the locking bolt -17- is rocked to one position and the lever -5 fis rocked in opposite directions the screw 4l-- will be rotated in one direction, as for exam le, to elevate the and when said pawl is reversed, the same back and forward rockingmoveinent of the lever will cause the screws to be depresse or lowered. the pawl %17-' is rocke to one side or the other of its extreme positions,` it is held in such position by the interlocking of the handle *20- in the lateral offset -13- ofthe slot -12- where it engages the pawl from its adjusted "position, said pawl being forced to its engaging position by' the spring -18- which isv interposed be-y tween the shoulder on the end' of the pawl and end of the socket -16-, The length of the oilset -13- of the slot +12-f is somey what greater than the depth of the. teeth of the ratchet wheel --5'- to. allow. a. limited endwisemovement of the pawl without disengagng the handle QD- from the' opposite sides of the offset slot -13-2 rIhe tubular end '-9.- of the lever --8- is held closely against the under side of the ratchet wheel .-/5- by Y means vof la collar -25- which is fitted u on the, upper end of the screw -4- and he d in place by a set screw 2dl When it is desired vto reverse the pawl ratorsimpl engages the handle and forces t e pawl bac against the action of the spring 1S-*until the pawl 17l 1s registered with the slot ,12l whereu on said handle lmay be 4reversedv or` roc ed. through` the slot 124- thereby reversing the` awl -17-, the spring serving to autof mat'lbally force the pawlfinto engagement with the teeth ofthe ratchet wheelas soon' as' the arm isregistered the recesses e134.- f l l The screwl 145:- is preferably left. handV pitch while the inner screw -6fis ofi opposite or rightV hand pitch'which r upright and provide vjiusted with one or the other of ndwitha,

raising the load would be more or less awkward and would re uiresuch lever to be pushed by the ri ht andinstead of pulled a under which con itions the power would be somewhat less. f

Whatl claim is: l 1. In a lifting jack, a tubular upright support having its upper end reduced and thraded internally, a left hand ,y tubular screw screwed into the upper reduced end of'ithe at its u per end with a, ratchet wheel, said up erend) 4 screw being threads internally, a right hand screw screwed into theu rper end f the tubular screw, a rest secure tothe u per end of the inner screw, a. lever journals Von"y of the tubular the uppxer end of the tubular screw wholly under t e ratchet wheel and rovided a y slot opening from its top, sai slot having an laxial offset at its base, a straight yawl slid-r able axially in the lever across sai slot and having its inner end beveled on one side only and its intermediate portion rovided wit an outwardly pro'ectmg han e movable in said slot into and out of the offsets for reversing the pawl andlocking it in either of its adjusted positions, and a spring for forcing said pawl into engagement with the ratchet wheel. Y y 2.1 A lifting 'ack comprising a tubular upright su port aving an internally reduced threa'de portion at 1 ts upper 6nd,. a' tubular l screw engaging said threaded portion and' having its upper end proyided with a ratchet ,y

wheel and a reduced internally threaded `portion,V an inner screw engaging the threaded portion of the tubular screw and provided at lts upper end with a' rest,` said screws being of opposite pitch, a lever having a ,tubularv end Journaled on the u perV end of the .tubuf` lar screw wholl below t e ratchet wheelia c01- lar on the tubu arscrew for holdin 'the lever in proximit to the under side of t e ratchet wheel, said ever being'provirled with an aioy ial opening; 'and a transverse slot intersecting -said opening, the slot Abeing with an axially extending oisetri t e plane of the ratchet wheelz a straight slidin` pawl movable in said opemng and rockable t erein,

said pawl being provided witlra handle movable in the slot lnto and outvof the offsets for reversing'jthe pawl and 'locking itin its adposition..

iro

rovided f .In witness whereof I have hereunto' s et my n hand this 22ndda of October 1908i i ,.iofrinn sfrArLoR, Witnesses; i HsanrD. BENHAM, Grosso J. Warm. 

